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3rd HyMeX workshop 1-4 June 2009 Heraklion (Gournes), Crete-Greece

A network of precipitation and wind profiler radars along the Mediterranean sea northwestern basin for the HyMeX Enhanced Observation period (EOP)

Jean-Luc Caccia (L.S.E.E.T.); O. Bousquet (CNRM/ Météo-France), V. Ducrocq (CNRM/Météo-France) and F. Saïd (CRA/LA/OMP) and colleagues from French (LA, CNRM, SA, LaMP, Météo-France) and Italian (ISAC-CNR, INFN) institutes

In the framework of the EOP over western Mediterranean, the deployment of a UHF-radar wind-profiler network along the french Mediterranean coastline was proposed (JL Caccia, 1st and 2nd HyMeX workshops). In the present abstract and poster, the addition of VHF wind profiler radars, weather radars and UHF and VHF wind profiler radars operated by Italian institutes is considered. The VHF radars allow higher tropospheric levels to be investigated, the weather radars allow the rain distribution and the associated wind field to be retrieved, and the Italian radars allow wind measurements in the eastern part of the northwestern basin.

The data of such a network could contribute to the two following main HyMeX scientific thematics :

(WG3) Heavy precipitation, flash-flooding and flooding : Experimental documentation of the dynamics of the heavy precipitation systems coming from the sea as well as the marine flow which feeds them. It should help to improve the determination of precursors to such rain episodes. Moreover the Cevenol area (south part of the Massif Central) has been defined as a target area regrouping different and complementary instrumentation including weather and wind profiler radars. In this specific area the purpose is to obtain a dataset allowing a very fine and detailed documentation of the thermodynamic field in heavy precipitation situation. The network of wind profilers, settled on the French and Italian coasts and on islands such as Balearic Island or Corsica will provide a global view of the wind-field over the northwestern part of the Mediterranean basin that allows to document the heavy precipitation mesoscale environment and cyclogenesis above the basin. Furthermore, upstream continuous profiles of water vapour content could be obtained by UHF/VHF collocated radars.

(WG4) Intense sea-air exchanges : Experimental documentation of regional offshore wind regimes : Tramontana (Nice), Mistral (Toulon and/or Marignane), or Tramontane (Narbonne-Perpignan), able to induce sea surface cooling and dense water formation which makes possible oceanic convection. Those profilers settled along the coast will enable the monitoring the land-to-sea wind systems leading to intense air-sea interactions.

Finally, radar data collected in this framework will be made available for assimilation in high-resolution data NWP systems such as AROME. Impact observation studies will be carried out to measure the consequence of radar data assimilation on short-range forecast of intense precipitation and regional winds.

In order to fullfil the objectives and regarding the present time available instruments, two additional UHF wind profilers are required. Any proposal from the HyMeX community to complement the present network is welcome.